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Placement of plugins in menus and toolbars are controlled by Calibre, not the plugins themselves.
Look in Calibre's Preferences > Toolbars & Menus to (re)add the plugins. There are a lot of different places you can place plugins which only show up in certain conditions--when device is attached, when it isn't, library context menu, split context menu, etc.
It's not uncommon to add a plugin to to a conditional toolbar or menu and not realize the difference.
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